Weather Fronts #1
What is a front?
the boundary between two air masses
What is the condition of Earth’s atmosphere at a certain time and place?
Weather
What causes wind?
When a high pressure system goes to a low pressure system. The greater the difference, the stronger the wind.
In what direction does air exert pressure?
What direction do the fronts move in?
In the direction the symbol is pointing.
How is a high pressure system formed?
cool air sinks
How does a cold front form?
When a cold air mass pushes under a warm air mass, forcing the warm air mass to rise.
What is the measure of how hot or cold something is?
Temperature
cold, cloudy, rainy
In high pressure the molecules....
are pushed down making them more dense.
What kind of front involves 3 different air masses?
Occluded Front
What is created by a difference in air pressure?
Wind
What symbol is used to represent a stationary front?
line with triangles and half circles on opposite sides.
What is the amount of water vapor in the air?
Humidity
What is the force of the atmosphere on the surface of the earth?
Air pressure
What causes difference of air pressure around earth?
warm air rises, cold air sinks
Are air masses that form over land dry or moist?
Dry
What does the H represent on a map and how does the wind move?
High pressure. In our area, High pressure and clockwise Low pressure is counter clockwise. ( L)
What kind of weather does an occluded front bring?
Strong winds and heavy rain.
What forms when water vapor condenses in the atmosphere?
Clouds
What happens when air is warmed or heated by the sun?
It rises
If a high pressure system is moving in, what kind of weather would you expect?
sunny, warm
What kind of weather is associated with a cold front?
Thunderstorms
What kind of front could create tornadoes?
Cold front
How does an occluded front form?
What is used to measure air pressure?
Barometer
What causes a low pressure system?
warm air rises and condenses as it cools
Where do areas of high pressure go?
to areas of low pressure.
Along a front, which air is forced upwards?
Warmer, less dense air
What kind of front has sunny weather?
No front